In the book the snows of Kilimanjaro how has harry spend his life betraying himself?

This last regret is made so bitter to Harry because, as he admits, it is his own fault he has not adequately exercised his great talent: "He had destroyed his talent by not using it, by betrayals of himself and what he believed in." In a strange parallel, it is also Harry’s fault that he developed gangrene; by not using iodine on his scratch, he allowed it to become septic and is therefore to blame for his impending death. Viewed in this light, Harry’s predicament is self-inflicted, and is therefore a fitting punishment for his repeated acts of self-betrayal over the years. The lingering question of the story is how Harry’s situation is resolved